From 1d4chan
Nemesis Chapter
Nemesis SP.jpg
Founding Second Founding
Successors of Ultramarines
Chapter Master Unknown
Homeworld Lex Talonis (fleet-based)
Strength Unknown
Specialty Exterminatus actions.
Allegiance Imperium of Man
Colours Dark Green with Red-Orange Accents.

The Nemesis Chapter. Now that's a kickass name. Cool factor turned up to 11. Probably the only chapter with a name cooler than the mother fuckin' ass blasting Destroyers.

Anyways. What happens when you take a company of Destroyer Marines during the Great Crusade from a generic Legion and have them work with the Night Lords? You get the Nemesis Chapter. These guys have the potential to be awesome, if it weren't for the spot-light being cast on others at any given moment.

Anyways, the Nemesis Chapter was originally the 22nd chapter of the Ultramarine Legion. During the Great Crusade, this chapter was mainly composed of Terran-born Destroyers, marines whose main weaponry was considered "too cruel" to use on other humans even by the low standards of 40k. This meant that these guys used the most destructive weaponry that the Imperium could pull out at the time, with shit like rad missiles (if they didn't blow you up on the spot, you'd still die of space cancer) and phosphex grenades being the norm for them. Since such work wasn't used all the time, they were relegated to sitting back and waiting till their commanders said "Fuck it, nuke everything." Oddly, these guys wound up working with the VIIIth Legion during this time and became quite good at blowing up planets. Eventually, the 22nd started to dress up like the Night Lords until Roboute Guilliman put a stop to that. The chapter didn't quite like that, and especially after Emps made big blue burn up Lorgar's faith project, they had concerns that they would be next since because of the chapter's less-than-palatable existence and the fact that they didn't uphold the standards of their Ultramar-born brothers. However, once the Heresy broke out, the 22nd stayed true to their roots and remained loyalists. After the Heresy, they were made into their own Chapter as a part of the Second Founding. As a reward, they were given a fucking Gloriana Class Battleship as their flag vessel. And not just any Gloriana Battleship, no. This was the Chronicle of Ashes, that was captured from the fucking Word Bearers. At least it was captured early on in M31, otherwise the amount of Chaos taint would've made it unsalvageable, and certainly a risk to the sanity of any loyal chapter. To this day, they still retain their dark history with a skull as their insignia.

Their last known engagement in the 41st millenium is the Orphean War, where they joined Battlegroup Salvation in the later stages of the conflict alongside the Red Seraphs and Executioners. They have been tasked with establishing a cordon to prevent the Necron Maynarkh Dynasty to spread into the neighboring Euridyce sector.

Chapters of the Adeptus Astartes
First Founding
Blood Angels - Dark Angels - Imperial Fists
Iron Hands - Raven Guard - Salamanders
Space Wolves - Ultramarines - White Scars
Second Founding
Angels of Absolution - Angels Encarmine - Angels Porphyr
Angels of Redemption - Angels Sanguine - Angels of Vengeance
Angels Vermillion - Aurora Chapter - Black Consuls
Black Guard - Black Templars - Blood Drinkers
Brazen Claws - Crimson Fists - Destroyers
Doom Eagles - Eagle Warriors - Excoriators
Fists Exemplar - Flesh Tearers - Genesis Chapter
Inceptors - Iron Snakes - Libators
Lions Sable - Marauders - Mortifactors
Nemesis - Novamarines - Obsidian Glaives
Patriarchs of Ulixis - Purple Stars - Praetors of Orpheus
Rampagers - Raptors - Red Talons
Revilers - Silver Eagles - Silver Skulls
Soul Drinkers - Storm Lords - White Consuls
Wolf Brothers
Third to
Twelfth Founding
Astral Claws - Angels Revenant - Charnel Guard
Dark Paladins - Executioners - Flesh Eaters
Halo Brethren - Howling Griffons - Iron Knights
Mantis Warriors - Marines Malevolent - Night Swords
Sable Swords (initial) - Scythes of the Emperor - Space Sharks
Sons of Guilliman
Thirteenth Founding
Death Spectres - Exorcists
Fourteenth to
Twentieth Founding:
Angels of Fire - Avenging Sons - Celebrants
Twenty-First Founding
Black Dragons - Blood Gorgons - Fire Hawks
Flame Falcons - Lamenters - Minotaurs
Sons of Antaeus - Tiger Claws
Twenty-Second to
Twenty-Sixth Founding
Angels of Vigilance - Celestial Lions - Dark Hunters
Disciples of Caliban - Emperor's Spears - Fire Angels
Imperial Harbingers - Iron Lords - Knights of the Raven
Marines Errant - Mentors - Fire Claws/Relictors
Star Phantoms - Subjugators
Ultima Founding
Angels of Defiance - Black Vipers - Blades of Vengeance
Castellans of the Rift - Fulminators - Knights Cerulean
Knights of the Chalice - Knights of Thunder - Necropolis Hawks
Nemesors - Praetors of Ultramar - Rift Stalkers
Silver Drakes - Silver Templars - Sons of the Phoenix
Storm Reapers - Umbral Knights - Unnumbered Sons
Valiant Blades - Void Tridents - Wolfspear
Unknown Founding: Absolvers - Accipiters - Adulators
Angel Guard - Angels Eradicant - Angels of Retribution
Astral Knights - Blood Ravens - Blood Swords
Brazen Drakes - Brothers Penitent - Crimson Castellans
Crimson Consuls - Crimson Scythes - Dark Hands
Dark Sons - Death Eagles - Emperor's Shadows
Fire Lords - Guardians of the Covenant - Graven Spectres
Hammers of Dorn - Harbingers - Hawk Lords
Invaders - Iron Crusaders - Iron Talons
Jade Dragons - Knights of Blood - Knights Unyielding
Marines Exemplar - The Nameless - Night Watch
Rainbow Warriors - Reclaimers - Red Hunters
Red Scorpions - Red Seraphs - Red Templars
Retributors - Sable Swords (refounded) - Shadow Wolves
Solar Hawks - Sons of Orar - Star Dragons
Stormwatchers - Storm Giants - Storm Wardens
Valedictors - Viper Legion - Vorpal Swords
White Templars - Storm Wings
Unsanctioned Founding: Consecrators (founding unknown, but likely after 2nd Founding)
Sons of Medusa (separated from parent Chapters, ratified by edict)
Steel Confessors (de facto 22nd Founding, de jure ratified by edict)
Others: Astartes Praeses - Deathwatch - Grey Knights